Add a new Router class for making requests targeted at specified ip …

[goodjava]

Add a new Router class for making requests targeted at specified ip and port
有时候调用需要指定ip和port,而且每次可能发生变化,比如测试调用线上指定服务器的provider
这种方式好处是比url里设定更动态一点.每次调用我都可以指定新的,并且provider不用打任何tag

[codecov-commenter]

Codecov Report

Merging #7756 (e851c97) into master (e419a2f) will increase coverage by 0.30%.
The diff coverage is 68.42%.

@@             Coverage Diff              @@
##             master    #7756      +/-   ##
============================================
+ Coverage     59.17%   59.47%   +0.30%     
- Complexity      529      557      +28     
============================================
  Files          1080     1086       +6     
  Lines         43650    43780     +130     
  Branches       6372     6385      +13     
============================================
+ Hits          25829    26039     +210     
+ Misses        14961    14874      -87     
- Partials       2860     2867       +7     

Impacted Files	Coverage Δ	Complexity Δ
...luster/router/address/AddressInvokersSelector.java	45.45% <45.45%> (ø)	0.00 <0.00> (?)
...ache/dubbo/rpc/cluster/router/address/Address.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...c/cluster/router/address/AddressRouterFactory.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	52.45% <0.00%> (-18.04%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-6.90%)	0.00% <0.00%> (ø%)
...ain/java/org/apache/dubbo/config/MethodConfig.java	95.65% <0.00%> (-3.09%)	0.00% <0.00%> (ø%)
...fig/configcenter/TreePathDynamicConfiguration.java	77.14% <0.00%> (-2.86%)	0.00% <0.00%> (ø%)
...bo/registry/client/FileSystemServiceDiscovery.java	67.44% <0.00%> (-2.33%)	0.00% <0.00%> (ø%)
...figcenter/file/FileSystemDynamicConfiguration.java	31.42% <0.00%> (-0.96%)	0.00% <0.00%> (ø%)
... and 42 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e419a2f...e851c97. Read the comment docs.

[AlbumenJ]

Maybe we can add some conditions to Activate annotation, so it can be enabled optionally.

[goodjava]

get

[AlbumenJ]

can this be simplified to @Activate(value = AddressRouterFactory.NAME)

[goodjava]

get

[AlbumenJ]

LGTM.
I will merge this PR later.
In the future, we can move this implement to dubbo-spi-extension.